Following up on this:

I think I was lacking salt. All my major meals the last 4-5 days have been cooked by other people. My father was visiting, and we had dinner with my sister and BIL. My BIL is sodium sensitive, so none of the meals they cook have much salt in them. I always cook with sea salt. So, bring low on salt, busy at work drinking a lot of pretty clean, filtered water, then bring an idiot and trying to work out again, which was just a big mistake, pushed me over the limit and lead to my awful cramping episode.

Things to change:

Magnesium supplements are ordered.

Minerals to add to my water are ordered.

Give up on working out. 😕